Coil with multiple adjustments



Patented Apr. iz, i927. .i

UNITED` STATES PATENT OFFICE.

'.r. mortals, oF NEW Yonx, mcoaroaa'rnn, oir NEW YORK, N. Y., A CORPORATION F NEW YORK.

COIL WITH MULTIPLE ADJUSTMENTS.

Application filed June 30, 1923.` `Sellal No. 648,684.

This invention relates to coils with multiple adjustments. It is an object of this invention to provide coils that are capable of a pluralitybf adl justments of different kinds and of different de rees.

more specific object of this invention relates to an inductance coil capable of both fine and coarse adjustments.

A feature of this invention relates to means associated with an inductance coil for making both slow and rapid adjustments of a contact member.

An additional feature concerns a stop l mechanism which allows a complete turn of an inductance coil to be made for effecting precise adjustments. a

One concrete embodiment of this invention may comprise a threaded insulated cylinder wound with a coil of baro wire and rotatably supported upon a shaft. A ear driven contact device may be operate by a screw and may be transversely movable along the winding of the coil. For allowing ,il one complete turn of the coil a stop mechanism having alimited movement ma be rotatably mounted upon the shaft an ar- `ranged to4 engage a projecting `lu on the insulating cylinder. Adjusting kno s may alsoA I0 be provided having indicating dials whereby various adjustments may be accurately re ated.

ylhe nature of this invention and its othery features and advanta es will be apparent 3l. from a consideration 0% the detailed description which follows in connection with the accom an ing drawings.

Int e ra-wings, Fig. 1 illustrates in detail and partly in section one form of this invention. Figs. 2 and 3 show sections taken on line 2 2 of Fig. 1 which illustrate the stop mechanism. Fig. 4 shows a cross section of the contact member and insulating cylinder on line 4--4 of Fig. 1.

In the device shown in Fig. 1', a threaded insulating cylinder 10 carrying a helical winding 11 consisting of a plurality of turns of a bare conductor positioned in the grooves or threads constitutes a solenoidal inductance coil. The cylinder 10 is referably rotatably mounted on shaft 12 wEich is rigidly attached to a supporting post 13, for example, by means o a nut 25. The cylinder 1() 4and its associated winding l1 may be rotated by means of knob 14 attached to a short spindle 16 which in turn is attached to the end plate 17 by a nut 38. The spindle 16 is provided with a hub lfrotatably litted to the end of shaft 12. The end plate v17 is fitted to the end' of cylinder 1() and held by means of screws'. lhe opposite end of cylinder' 10 may be closed except for an openmg at its center through which the shaft 12 passes. A spring 40 and a Washer 41 are positioned on the shaft 12 between the nut 31 and cylinder 10 in order to provide Sullicient friction to prevent cylinder 10 from rotating when knob 27 is turned.

The movable traveler 18 which is threadedto shaft 19 is held in a slot formed in the supporting member21 and is consequently 'incapable of rotary movement. The

traveler 18 carries a wiper 20 which is in contact with the bare conductor 11. shaft 19 is rotatabl mounted upon bearings 22 and 23 which may be integral with supporting member 21. A pinion 24 is attached to one end of shaft 19 and engages a ar 26 which may be rotated by means of grob 27 connected thereto by means of sleeve 28 mounted concentric with the spindle 16.l The coil mechanism may be supported by an insulating panel 29 and post 13 attached to a base 30.

In Fig-2 is shown a section on line H of Fig. 1 which illustrates the stop mechanism. The supporting member 21, which is vThe mounted upon the shaft 12 and held in posi-p tion by means of lock nut 31, has two prongs 32 and 33 projecting beneath the shaft 12. A dog 34 yis rotatably supported upon shaft 12 and having an extension between the prongs 32 and 33. These prongs limit the motion of the dog to the space therebetween. The dog is so positioned that, when the cylinder 10 is rotated, the lug 35 projecting from the end of the cylinder will engage the extension of the dog 34. i

In Fig. 2, the lug 35 and the dog 34 are shown in their relative positions with the c linder rotated as far as possible inthe clockwise direction. In Fig. 3, the position of lug 35 and dog 34 is shown with the cylinder rotated as far as possible in a counter-clockwise direction. It is a parent from these figures that the movable og operating between stops 324 and 33 enables a complete revolution of the cylinder 10 te be made by allowing for the width of the lug 35. It is further apparent that the space required between the prongs 32 and 33 to enable a complete revolution of the cylinder 10 should be equal to twice the width of the extension of dog 34 plus the width of the lug 35.

Fig. 4 shows a cross-section through the 'shafts 19 and 12 and cylinder 10 along the line 4-4 of Fig. 1. Traveler 18 carrying wiper 2O is shown positioned in the roove between the sides of supporting mem er 21 and threaded to the shaft 19. The supporting member 21 prevents the rotation of the traveler 18 and its associated wiper 20 when the shaft 19 is rotated.

In the operation of this coil, coarse adjustments ore obtained by rotating knob 27, which thereby operates the gear and pinion 2G and 24 to rotate the shaft 19. This causes a transverse movement of the traveler 13 and wiper 2O along the winding 11. By means of this adjustment, the finest variation obtainable is one full turn of the coil. To obtain finer adjust-ments in fractions of one turn, cylinder 10 may be rotated by means of knob 14. The wiper 2O has a contact surface equal to the pitch of the winding 11, whereby as the cylinder 10 is rotated through one revolution, continuous contact will be maintained with thek conductor.

Although the invention disclosed herein has been described and explained in connection with certain specific embodiments, it is not the intention that the new principles set forth should be limited to these concrete illustrations, since they are applicable to numerous other modi cations which will readily occur to persons skilled in the art.

Vh-atis claimed is:

1. A variable inductance comprising a. grooved rotatable insulating cylinder, a helical winding on said cylinder, a yielding member associated with said winding for making electrical contact therewith. a rotatable shaft which rotates independently of. said cylinder, means including said shaft Jfor causing said yielding member to move from turn to turn of said coil, and separate means including said cylinder for making complete adjustment around the turn upon which said yielding member rests.

2. An electrical coil comprising a rotatable insulating cylinder, a helical winding thereon, a movable contact member electrically connected to said winding, means for making continuous adjustment of the contact of said member with any turn of said coil, and a mechanism Jfor limiting the angular revolution of said cylinder comprising a lug on said cylinder and a dog capable ot' limited movement, adapted to engage said lug.

3. The combination with'a variable inductance of a helical winding upon an insulating cylinder having a projecting lug of means associated with said cylinder comprising a dog and separated stops, said dog being movable between said stops, and capable of engagement with said lug for permitting a complete revolution on y of said cylinder.

4l. The combination with a variable coil of a. rotatable cylinder having a projecting lug, a stop mechanism including a dog having limited motion and arranged to engage said lug for controllinr the angular motion of said cylindery witiin limits, a movable contact member, and a gear device operated by a knob said contact member relative to said coil may be varied.

5.' An adjustable coil comprising a circu-l lar drum rotatable upon a'shaft, a member supported parallel to said shaft, a contact member movable parallel to the axis of said drum in a slot formed in said member, and a yieldin brush associated with said contact mem er and means for controlling the relative motion between said drum and con tact member for making adjustment from turn to turn of said coil and continuously around a plurality of said turns.

6. An inductance coil comprising a grooved insulating cylinder, a helical winding of a bare conductor on said cylinder, a knob connected to said cylinder whereby the same may be rotated, a contact mechanism including a gear for making electrical connection with said windin and a second knob, concentric with said lgirst named knob, associated with said gear for adjusting said contact member.

7 An inductance coil comprising a cylindrical drum rotatable upon a fixed shaft and provided with a winding of bare conductor, a rotatable shaft parallel to said fixed shaft, a contact member threaded to said rotatable shaft, means for driving said drum and said rotatable shaft` whereby double adjustment of said inductance may be obtained, and means limiting the angular motion of said drum to one complete revolution.

8. A variable inductance, comprising a rotatable solenoidal coil, a contact device in electrical connection with said coil, means for rotating said coil, and means for moving said contact member said means comprising whereby the position of l 'concentric knobs provided with dials-v'vhere-4 i' by thje adjustments of said coil and said contact member may be indicated.

n 9. An adjustable coil, comprising a frame, 5 a' rotatable cylinder carrying a solenoidal winding, a rotatable shaft connected to a.

movable wiper engaging said coil, said shaft v ltending'to cause rotation of said cylinder, v. 

